The police still haven’t found the lost child, but they’re doing all they          .

A．can B．may C．must D．should

A

解析試題分析：考查情態(tài)動(dòng)詞。can表能力， may可能，可以， must必須，D. should應(yīng)該， do all（that）one can意為：“竭盡全力”。句意為：“雖然警察仍未找到那個(gè)失蹤的孩子，但他們正竭盡所能�！边xA。
考點(diǎn)：考查情態(tài)動(dòng)詞

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